Fanuc Parameter 1860 Full //top\\

Never set Parameter 1860 to 0 or an extremely high value as a "fix" for a mechanical problem. This disables a vital safety check and can lead to machine crashes or damage to the ball screws.

Understanding Fanuc Parameter 1860: Absolute Position Detection

Parameter 1860 and Parameter 1825 (position loop gain) work in tandem. If you increase 1825 for higher stiffness, you may need to decrease 1860 to avoid instability. Conversely, a low 1825 with a very low 1860 will cause overshoot. fanuc parameter 1860 full

| Feature | Detail | |---------|--------| | | 1860 (axis 1), 1861 (axis 2), … | | Purpose | Final approach speed for G28 reference return | | Units | mm/min (metric) or 0.1 inch/min (inch) | | Typical range | 500 – 6000 mm/min | | Key constraint | Must be ≤ parameter 1420 (Rapid) | | Failure mode if too high | Missed reference signal → alarm or position drift | | Failure mode if too low | Long cycle time, but safe |

A smaller 1860 value means faster acceleration/deceleration (sharper moves). A larger value means gentler, slower ramping. Never set Parameter 1860 to 0 or an

If you disconnect the motor from the ball screw, the physical relationship between the encoder and the machine zero changes.

When you adjust Parameter 1860, you are not moving the physical limit dog. You are electronically shifting where the control the grid point is. If you increase 1825 for higher stiffness, you

Parameter 1860 is mathematically linked to .

Older controls (Fanuc 6, 10, 11, 12, 15) use different parameter numbering. For example, on Fanuc 15, the reference shift might be Parameter 700+ (axis-specific). Check your yellow Fanuc manual.